Consider the following data showing complex ions in aqueous solution and their K

Question

Consider the following data showing complex ions in aqueous solution and their K f values.

Based on this data, which of the following is correct?

A. ZnCO3 will be more soluble in NH3 than pure water.
B. Zn(CN)2 will precipitate if NaCN is added to a solution containing Zn2+ (aq).
C. Zn(OH)2 is more soluble at lower pHs than higher pHs.
D. CN? is a weaker Lewis base than water.

Consider the following data showing complex ions in aqueous solution and their K f values. Based on this data, which of the following is correct? A. ZnCO3 will be more soluble in NH3 than pure water. B. Zn(CN)2 will precipitate if NaCN is added to a solution containing Zn^2+ (aq). C. Zn(OH)2 is more soluble at lower pHs than higher pHs. D. CN^? is a weaker Lewis base than water.

Explanation / Answer

Statement A: As Kf is greater for OH- ion than NH3 ion, this means HOH complexes more and hence solubility is less in water. Hence, ZnCO3 will be more soluble in NH3 than H2O. CORRECT.

Statement B: No, as the Kf is very high for the complex Zn(CN4)2-, the same will be formed and not Zn(CN)2. INCORRECT.

Statement C: At lower pH, there will be more of H+ ions, that means that complex ions will be more at low pH and hence solubility will be less. So, given statement is INCORRECT.

Statement D: Lewis base is one which can easily donate a pair of electrons and CN- is a strong lewis base. So, INCORRECT.

So, only correct option is A.

Have a nice day!

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